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The number of people has increased in a series of steps by around five orders of magnitude over the past 100 000 years as geographical dispersal and cultural changes expanded access to food and other resources. The last 10-fold increase has occurred in just over two centuries....

The number of people has increased in a series of steps by around five orders of magnitude over the past 100 000 years as geographical dispersal and cultural changes expanded access to food and other resources. The last 10-fold increase has occurred in just over two centuries....